From
Wikipedia Nash Equilibrium - "Stated simply, you and I are in Nash equilibrium if I am making the best decision I can, taking into account your decision, and you are making the best decision you can, taking into account my decision. Likewise, many players are in Nash equilibrium if each one is making the best decision (s)he can, taking into account the decisions of the others."
For the nash calculator - is it hurting us, helping us, or doesn't matter when our opponents aren't in equilibrium with us?